Use SoapClient PHP with proxy for HTTP/HTTPS connections

ProxySoap.php

<?php

$parameters = [
    'proxy_host'     => "127.0.0.1",
    'proxy_port'     => 8888,
    'stream_context' => stream_context_create(
        array(
            'ssl' => array(
                'verify_peer'       => false,
                'verify_peer_name'  => false,
            )
        )
    )
];
$client = new \SoapClient('url.wsdl', $parameters);